function MM_openBrWindow(theURL,winName,features) { 
window.open(theURL,winName,features);
}
function guan(){
if (document.layers){
layers['layer1'].visibility='hidden';
layers['layer2'].visibility='hidden';
layers['layer3'].visibility='hidden';
layers['m1'].display="";
layers['m2'].display="none";
layers['m3'].display="";
layers['m4'].display="none";
layers['m5'].display="";
layers['m6'].display="none";
}
else{
Layer1.style.visibility='hidden';
Layer2.style.visibility='hidden';
Layer3.style.visibility='hidden';
m1.style.display="";
m2.style.display="none";
m3.style.display="";
m4.style.display="none";
m5.style.display="";
m6.style.display="none";
}
}

function t1(){
if (document.layers){
layers['layer1'].visibility='visible';
layers['layer2'].visibility='hidden';
layers['layer3'].visibility='hidden';
layers['m1'].display="none";
layers['m2'].display="";
layers['m3'].display="";
layers['m4'].display="none";
layers['m5'].display="";
layers['m6'].display="none";
}
else{
Layer1.style.visibility='visible';
Layer2.style.visibility='hidden';
Layer3.style.visibility='hidden';
m1.style.display="none";
m2.style.display="";
m3.style.display="";
m4.style.display="none";
m5.style.display="";
m6.style.display="none";
}
}

function t2(){
if (document.layers){
layers['layer1'].visibility='hidden';
layers['layer2'].visibility='visible';
layers['layer3'].visibility='hidden';
layers['m1'].display="";
layers['m2'].display="none";
layers['m3'].display="none";
layers['m4'].display="";
layers['m5'].display="";
layers['m6'].display="none";
}
else{
Layer1.style.visibility='hidden';
Layer2.style.visibility='visible';
Layer3.style.visibility='hidden';
m1.style.display="";
m2.style.display="none";
m3.style.display="none";
m4.style.display="";
m5.style.display="";
m6.style.display="none";
}
}

function t3(){
if (document.layers){
layers['layer1'].visibility='hidden';
layers['layer2'].visibility='hidden';
layers['layer3'].visibility='visible';
layers['m1'].display="";
layers['m2'].display="none";
layers['m3'].display="";
layers['m4'].display="none";
layers['m5'].display="none";
layers['m6'].display="";
}
else{
Layer1.style.visibility='hidden';
Layer2.style.visibility='hidden';
Layer3.style.visibility='visible';
m1.style.display="";
m2.style.display="none";
m3.style.display="";
m4.style.display="none";
m5.style.display="none";
m6.style.display="";
}
}